Refrigeration



April 7,- 1942. H. M. ULLSTRAND 2,279,017

\ REFRIGERATION I 'Filed April 7, 195s iz ATTORNEY Patented Apr. 7 1942 I Servel, Inc., New York,

Delaware N. Y.,' a corporation oi jj Application April 1.193s; Serial No. 200,514

'Claims.

My invention relates to refrigeration and ibis an object of the invention to provide a heat operated refrigeration system having control of cooling medium responsive to input.

The drawing shows more or less diagrammatically a uniform pressure absorption. refrigeration system embodying the invention.

The refrigeration system illustrated is generally like that described in application Serial No. 107,852 of Albert R. Thomas, now Patent No. 2,207,838 granted July 16. 1940. The description of. the apparatus in said application is hereby I incorporated in this specification. The system contains ammonia, water, and hydrogen. Other.

suitable fluids may be used.

In operation, ammonia vapor is expelled from solution in a generator l9 due to heatingby a heater or burner l9. The vapor flows through an analyzer 25, vessel 29, conduit 30, and rectifier 3| into the upper end of a condenser H in the evaporative water cooler 11. Ammonia vapor is condensed to liquid in condenser II and the liquid ammonia flows into a rectifier trap 36. Liquid ammonia flows from trap 36 through a con-' duit 61, precooler Qand conduit 68 into the upper part of an evaporator I2. I

Liquid ammonia flows downward over coil 4|. in evaporator I 2 and evaporates and diffuses into hydrogen, producing a refrigeration efi'ect 'on' I0 is being operatedata temperature below heat transfer fluid in coil ll. A pump II causes circulation of the heat transfer fluid through and between the coil ll and a coil 69 in a refrigerator compartment 10 for cooling this compartment. l

rator l2 and an absorber I3 by way of a gas heat exchanger l5. This circulation is caused by dif'-' ference in specific weights of gas in different parts of this circuit. In the absorber I3 ammore rapidly and the defrostingtemperature is vcoil ll. Circulation of water through and between the evaporati ve cooler I1 and absorber ll,

is caused by a pump 85 which is driven by an electric motor 9. A fan 80 for the'evaporative cooler or spraytower I1 is also operated by an electric motor which is connected to vconductors m in parallel with the pump motor llll; fOn'e motor may be used to-driveboth the pump and fan. The fan and pump motors are connectedv by the conductors or line I l I too. suitable source .of electrical supply, t shown;

In'the line [H is connected ia' t hermostatic 1 I switch 2 of which the sensitive'element' Sis located in the upper end of the .flue'of thfgen erator l0, Upon increase in (temperature; as

when the generator heater I9 is in operatiom'the thermostatic switch-H2 closes the circuit of me- I fan and pump motors, therebycausingfcooling of:

the absorber l3 and condenserll. When heat input to the generator llv is decreased br inter rupted, the. thermostatic switch 2 opens the motorcircuit and interrupts cooling'of the absorber and condenser. r

This automatic control is particularly useml when the coil 69 inthe-refrigerator compartment freezing and it is-desired tozdefrost this coil at I intervals. By interrupting cooling of'the ab-f sorber, IS, the refrigeration temperature and therefore the temperature of coil 89 increases more quickly reached.

. 5 maintains aw small flame for lig t the into weakened absorption solution which flows I "this temperature increases. a 1 predetej-med downward over coil 41. Absorption liquid circu lates through and between the-absorb,er"l3. and

liquid lift conduit 22 of. whicha lower coiled portion 20' is heated by the generator burner I9. I

The vapor liquid lift causes upward flow of liquid from the lower part of generator l9 into anelevated circulation vessel- 23 fromwhichnthe3 liquid overflowsintothe-absorber l3 through a'-- lating liquid in said circuit, anda'sec d'jcontrol, ,j'

v 'for stopping and starting said liqui 'circulaton of the liquidheat exchanger.

The absorber l3 is"cooled by flow oi water from The heater or gas burner. l9 is'turned onand oil? by a thermostatic valve I I4 responsive'to tem-' Gas circulates throughand between the evapoperature of heat transfer fluid flowing from the refrigerator coil 69 to the evaporator l2. A'pllo't burner l9 when gas is turned on by theth staticivalve Ill. The latter. is adjust mg; monia vapor is absorbed out of the hydrogen the gas is turned oil at a predetermined-low'tem, 'P rature of fluid fromcoil 99 and" turned on when cooling said absorber. and condenser and including anevaporator, a. liquid circulator'i'orcircuresponsive to the stopping and starting, respectively. of said heater.

the evaporative cooler 'I'l throughwthe absorber 2. A heat operated continuous refrigeration 1; Anabsorption type refrigeration system in "eluding a generatona heater'for'said generator; a control for stopping and. starting said heater-,

an absorber, a condenser, a liquid circuit for.

9,979,017 v I. heater for supp yinl heat to the thereby is projectedint of lnM ni 1e, cniohlorb ei',

a cooler for taking beet rejected by the e'cooier ior means-ine controiior atom l lndctertin: reid eluding a thermostat form. flidfcoolerrecooierraponsivetothestnrtinznnd ltop- 5 nuebythebumernme. e I otnidhcetcrincludincnthcrmoetet subis. A heat openited continuom mflm 3. An ebeorptionr frlmlflon system havinzheat receiving pert end e'heat'eriormbinr raio shooter-for eeidzenerator, 'n con- -,heat1to auchi heet receivin rcooier for 3 trol torchpppin: g aid h ecter, n when rejectedby lncther pert-oldie mf absorber. for slid-absorber, and a. second tem rwhen helt is being supplied to IIIIILWN- .contmitor a omlne and eta-tin: ceivinr pert I. circuit for liq'hid A n responsivc ele ind-tisccond" control to'rcn letc flow (illiquid. ment subjected to i'roln new r. lq illljlf r il fi inc u l & momma r 4. An ebeorpticn ,tcheetderived from said heater. 3 v

{llencntor wowidec withenueqenu a mei.

tor, and": lccond control to'stcrt Ind stop aponaivc to thehentin; in laid;-

when; derived hoinnidheeter. i mm 'a zumntrot mu madame js'ponrive to the starting for cold inclndinz an evaporator, econtroi fornid'hcotcr, 

